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Extension methods have special use in implementing so called fluent interfaces. An example is Microsoft's Entity Framework configuration API, which allows for example to write code that resembles regular English as closely as practical.
One could argue this is just as well possible without extension methods, but one will find that in practice, extension methods provide a superior experience because less constraints are placed on the [[class hierarchy]] to make it work - and read - as desired.
The following example uses Entity Framework and configures the TodoList class to be stored in the database table Lists and defines a primary and a foreign key. The code should be understood more or less as: "A TodoList has key TodoListID, its entity set name is Lists and it has many TodoItem's each of which has a required TodoList".
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